M o rti si n g - m ac hin e



(No Model.) 3 Sheets-wheat 1.

G. LOETSCHERF- MORTISING MACHINE.

No. 495,350. Patented Apr. .11, 1893 g/v4. I

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WITNESSES INVENTOI? m5 nonms PEYERS no. vuoroumo. wAsnmm'oN. a. c

(No Model.) 3 Sheets-Sheet 2.

.O. LOETSGHER. MORTISING MAOHINE.

No. 495,350. Patented Apr. 11, 1893.

WITNESSES: INVENTOI? ATTORNEYS.

(No Model.) 3 Sheets-Sheet 3.

a. LOBTSGHER. MORTISING MAGHINE.

No. 495,350. Patented Apr. 11, 1893.

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UNITED STATES PATENT ,OFFrcE.

CHRISTIAN LOETSOHER, OF DUBUQUE, IOWA.

MORTISING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 495,350, dated April 11, 1893.

Application filed April23, 1892. fierial No. 430,362. (No model.)

To all whom it may concern:

Be it known that I, CHRISTIAN LOETSCHER, of Dubuque, in the county of Dubuque and State of Iowa, have invented a new and Improved Mortising-Machine, of which the following is a full, clear, and exact description.

My invention is an improvement in the class of chain tool mortising machines.

' The invention consists of certain parts and details and combinations of the same, as will 'be hereinafter described and then pointed out in the claims.

Reference is to be had to the accompanying drawings forming a part of this specification, in which similar letters of reference indicate corresponding parts in all the figures.

Figure 1 isafront elevation of the improvement. Fig. 2 is a side elevation of the same. Fig. 3 is a sectional side elevation of the same on the line 33 of Fig. 1. Fig. 4 is an enlarged front View of the adjustable blocks for controlling the clamping device, with parts in section; and Fig. 5 is a side elevation of one of the said blocks.

The improved mortising machineis mounted on a suitable column A, from the rear end of which extends a frame A, carrying the shafting hereinafter more fully described. On the front of the column A are arranged the vertical guide-ways A on the lower part of which is fitted to slide the bed plate frame B, formed at its front with a semi-circular recess B, into which fits a correspondingly-shaped tilting frame O, adapted to be clamped to the bed frame by bolts 0', held in the said bed frame, and passing through slots in the said tilting frame O. From the latter extend forwardly guideways C in which is fitted to slide transversely the bed plate D, adapted to support the article to be mortised.

The transverse adjustment of the bed plate D is accomplished by the usual screwEscrewing in the tilting frame Cand turning loosely in a projection on the front end of the said 'bed plate D, the outer end of the screw being provided with a suitable handle E for turning the screw to move the bed plate D in or out on the guideways 0 In the top of the bed plate D is formed a transversely-extending recess in which is fitted to slide a clamping plate F, for locking the material to be mortised in place on'the bed plateD, the back of the material resting on a vertically-arranged gage G, supported on the bed-plate D, as hereinafter more fully described.

On a lug of the clamping plate F screws a bolt F, carrying on its inner end a plate F abutting against the front side of the material under treatment. By adjusting the screw F, the plate F can be moved in or out so as to bring the said platein proper position relative to the thickness of the material under treatment. The gage G extends longitudinally as plainly illustrated in the drawings, and is formed with downwardly -extending slotted arms G, engaged by bolts G screwing in the bed plate D and serving to hold the said gage in proper position, at the same permitting its vertical adjustment according to the size of the material under treatment.

On the top of the gage G is arranged a transversely-adjustable plate G adapted to engage the top of the material so that the latter is securely held in place on the bed plate by the back of the gage G, the top G the plate F and the clamping plate F. From the rear end of the clamping plate F extends transversely, a rod H, the axis of which forms the center for the semi-circular recess B in the bed plate frame B, so that when the tilting frame O is tilted it swings from the axis of the rod H. On the latter is secured a collar H, pressed on by a fiat spring H secured to the bed plate frame B; A second collar H is arranged on the end of the rod H, as will be readily seen by reference to Fig. 8, and this collar is engaged by the fork end of an arm H pivoted on the bed plate frame B. The pivoted arm H is curved rearwardly andcarries at its lower rear end a friction roller H adapted to travel over a series of blocks I, I, I 1 arranged alongside each other and resting with their backs on the column A. The V blocks 1, I and I are formed on their inner sides with pins 1 engaging corresponding grooves 1 arranged vertically in the sides of ICO upper part of the column A. Screws 1 screwing inthe said column at the sides thereof, serve to lock the said rods in place after the latter have been adjusted vertically to bring the several blocks I, I, I and 1 into the proper position according to the mortise to be cut into the material as hereinafter more fully described. The friction roller H on the pivoted arm H is adapted to travel up the two inclines l and 1 formed on the lower and upper parts of each of the blocks.

When the bed plate frame B rises the friction roller H travels over the inclines l of the several blocks, thus imparting a swinging motion to the arm H so that the upper forked end moves rearward and pulls on the collar H so as to move the rod H and the clamping plate F in a like direction,whereby the plate F is moved in contact with the front side of the material under treatment, and the said material is pressed against the gage H and securely clamped thereon.

When the friction roller H travels down either of the inclines l or 1 then the spring H pressing on the collar I-I causes a forward sliding of the rod H and the plate F so that the plate F is moved out of contact with the front side of the material. Thus, it will be seen that by the forward and downward movement of the bed plate frame B, the material is automatically clamped in position on the bed plate B and the gage G or automatically released as above described. The material is mortised by the usual chain tool J arranged above the bed plate B and passing at its lower end over the sprocket wheel J journaled in the lower end of an arm J 2 secured to atransversely-extending slide J mounted to slide vertically on the guideways A of the column A above the bed plate frame B. A screw rod J mounted to turn in the upper part of the column A screws in a nut on the said slide J and on the up per end of the said screw rod is secured a handle J for turning the screw rod so as to raise and lower the slide J and consequently the sprocket wheel J, to give more or less tension to the chain tool J. The upper part of the latter passes over the sprocket wheel J secured on the shaft K, extending transversely and mounted to turn in suitable bearings of which one is arranged on the upper end of the column A, and the other on the frame A.

On the shaft K and directly in the rear of the sprocket wheel J is secured an exhaust fan wheel L, revolving in a stationary casing L, fastened to the upper end of the column A. The casing L, is provided in its front with an opening L in close proximity to the upper part of the chain tool J, so that chips, dust, &c., adhering to the chain tool are drawn into the opening L by the suction blast, to be discharged through the outlet spout L arranged in the said casing L. A curved guard L is arranged on the front of the casing L, and extends over the top of the chain tool J, the said guard L being hinged or pivoted on a downwardly-extending straight guard plate L attached to the casing and which serves to guide any loose material up into the opening L to be discharged by the suction fan through the outlet spout L It will be seen that by this arrangement, the chain tool J, can be kept very clean so that a proper mortise will always be cut by the tool. By hinging the guard L access is had to top chain wheel.

On the shaft K is secured a pulley K over which passes a belt K also passing overa pulley N secured onthe driving shaft N, mounted to turn in suitable hearings in the lower part of the column A and frame A. On the outer ends of this shaft Nare secured the fast and loose pulleys N and N 3 connected by a belt N with counter-shafting for imparting a rotary motion to the said driving shaft N which, by the pulley N, the belt K and the pulley K imparts a rotary motion to the shaft K and the latter by the sprocket wheel J 6 causes the chain tool J to travel in the usual manner in order to cut the mortise in the material under treatment. The main driving shaft N also imparts a vertical sliding motion to the bed plate frame B, and the parts sup ported thereby, as previously described and for this purpose the following device is provided. The bed plate frame B is formed with a nut B in which screws the feed screw shaft 0 arranged vertically and mounted to turn in suitable bearings formed on the column A between the two guideways A On the upper end of the feed screw shaft 0 is secured a bevel gear wheel 0 in mesh with a bevel gear wheel 0 attached to the front end of a transversely extending shaft 0 mounted to turn in suitable bearings on the column A and frame A. On this shaft 0 is secured a fast pulley O on one side of which is arranged a loose pulley O and a like pulley O is arranged on the other side of the said fast pulley 0 as will be readily understood by reference to Figs. 2 and 3.

A belt P passes over the loose pulley O and is adapted to be shifted onto the fast pulley O ,as hereinafter more fully described, the said belt extending downwardly and passing over a pulley P held on the shaft N. Over the otherlooso pulley O also passes a belt1 adapted to be shifted from the said pulley 0 onto the fast pulley 0 as hereinafter more fully described, the said belt also passing over a pulley P secured on a transversely-extending shaft P mounted to turn in suitable bearings on the frame A. On this shaft P is secured a cone pulley P over which passes a cross belt P also passing over a cone pulley P secured on the driving shaft N. When the machine is not in operation, that is, when the belt N passes over the loose pulley N on the driving shaft N, then the latter is at a standstill and the belts P and-P both engage the loose pulleys O and O as plainly shown in Fig. 2. Now, in order to shift the said belts P and P automatically when the machine is in IIO operation, the following deviceis provided, the said device being actuated from the bed plate frame B. On the latter is secured a rearwardly-extending arm B engaging a rod Q mount-' ed to slide vertically on one side of the column A. On this red Q are secured the collars Q and Q located below-and above the said arm 13 as will be readily seen by reference to Fig. 2. The collars Q and Q can be an arm R extending rearwardly and formed at its rear end with a fork engaging one arm of a T-shaped shifting lever S, fulcrumed on the frame A and arranged to engage both belts P and P in such a manner that when one belt is moved toward the fast pulley O the other is moved away therefrom onto its corresponding loose pulley. When the shift ing lever S is in a normal position as illustrated in Fig. 2, both belts P and P are on their loose pulleys and consequently n0 r0 tary motion is given to the shaft 0 which actuates the feed screw shaft 0. The lower end of the rod Q is pivota-lly connected with the free end of an arm Q extending longitudinally in the lower part of the column A and pivoted thereto, as illustrated in Fig. 1. This arm Q is adapted to be engaged on top by a foot lever T extending transversely and fulcrumed at its rear end on the frame A.

From the fulcrumed end of the foot lever T, extends upwardly an arm T pivotally connected by a link T with one end of a shifting rod U mounted to slide transversely in suitable bearings on the frame A, the said shifting rod being provided at its rear end with two shifting arms U engaging opposite edges of the belt N. A spring U is coiled on this shifting rod U for holding the same in an outermost position as shown in Fig. 2, the said spring also serving to hold the foot lever T in an uppermost position as the latter is connected with the said rod U in the manner described.

The operation is as follows: When the several parts are in the position shown in Figs. 2 and 3, and the operator has placed the inaterial to be mortised onto the bed plate D be tween the gage G and the arm F and then presses the foot lever T, then the rod U slides forwardly and shifts the driving belt N onto to slide down ward, whereby the spring Q is pressed and at the same time the arm R held on the said rod Q actuates the double shifting lever S so that the belt P is shifted from the loose pulley 0 onto the fast pulley 0 The rotary motion of the main driving shaft N imparted by the cone pulleys P, P and the cross belt P to the shaft P now causes a rotary motion of the shaft 0 as the latter is now connected by the fast pulley 0 the belt P and the pulley P with the said revolving shaft P The rotary motion of the shaft 0 is transmitted by the bevel gear wheels 0 and O to the feed screw shaft 0, whereby the bed plate frame B is caused to travel upward on its guideways A as the said feed screw shaft 0 engages the nut B on the said bed plate frame B. On the upward movement of the bed plate frame B, the friction roller H travels up the inclines I on the blocks I, I, I 1 whereby the clamping plate F is caused to slide transversely as above described to securely clamp the material in place on the bed plate D. On the further upward movement of the bed plate frame B, the top of the material is broughtin contact with the lower cutting end of the chain tool J so that the mortise is cutinto the material. On the further upward movement of the bed plate frame B the mortise is cut to the desired depth or entirely through the material, as the case may be, the clamping plateF, as well as the bed plate D being provided with longitudinal slots for the passage of the lower end of the tool so as to prevent the latter from coming in contact with any metal on the bed plate and at the time it cuts through the bottom of the material under treatment. The collars Q and Q have been set on the rod Q according to the depth ofthe mortise to be cut, so that on the further rising of the bed plate frame B, the arm B finally comes in contact with the collar Q at the time the desired depth of the cut is reached. The arm B in, moving against the collar Q raises the rod Q whereby the arm R actuates the double shifting lever S so that the belt P is moved from the fixed pulley 0 onto the loose pulley O and at the same time the other belt P is moved from its loose pulley O onto the fast pulley 0 whereby the motion of the shaft 0 is reversed and the feed screw 0 is caused to travel in an opposite direction therebyimparting a downward sliding motion to thebed plate frame B and parts supported thereon. It is understood that the shaft 0 is reversed as above described owing to the reverse motion given to the shaft P by the cross belt P connecting the main driving shaft N with the shaft P When the bed plate frame B moves downward as above described, the chain tool J is finally withdrawn from the cutmade by it in the material and at this time the friction roller H of the arm H travels down the in-' cline l on the blocks '1, I, 850., so that the spring H causes a forward .sliding of the clamping plate F whereby the plate F is moved away from the front of the material, and the latter is thus released, and can be removed from the bed plate for the insertion of another piece of material to be mortised or the said material can be shifted on the bed plate for a new out. At this time, the bed plate frame B by its arm B engages the collar Q so that the rod Q is moved downward and the double shifting lever S is again actuatedand by it the belt P is moved from the fast pulley 0 onto the loose pulley O and at the same time the other belt P is moved from the loose pulley 0 back onto the fast pulley 0 whereby a rotary motion is given to the shaft 0 in an opposite direction from the one it previously had, so that the feed screw 0 revolves in an opposite direction and again feeds the bed plate frameB upward on the guideways A and the above described operation is repeated.

It will be seen that by this machine, after it has once started no further attention is required so far as the working parts are concerned, as the several mechanisms are actuated automatically and the operator only removes the material to be treated or shifts the same on the bed plate D, so as to bring the material in'the proper position for the tool to mortise the same at the proper spot.

Having thus fully described my invention, I claim as new and desire to secure by Letters Patent 1. The combination, with the work-table, adapted to reciprocate vertically, of a clamping plate sliding transversely on said table, an arm pivoted to the table, and blocks having inclines and arranged in the path of the said arm and made adjustable, substantially as shown and described, for the purpose specitied.

2. The combination with a bed plate frame, of a tilting frame mounted to turn on the said bed plate frame, a bed plate held laterally adjustable on the said tilting frame, and a clamping plate fitted to slide on the said bed plate and provided with a rod, the axis of which forms the center of the said tilting frame, substantially as shown and described.

3. The combination with a bed plate frame, of a tilting frame mounted to turn on the said bed plate frame, a bed plate held laterally adjustable on the said tilting frame, a clamping plate fitted to slide on the said bed plate and provided with a rod, the axis of which forms the center for the said tilting frame, and a spring for holding the said clamping plate in a normal position, substantially as shown and described.

4. The combination with a bed plate frame, of a tilting frame mounted to turn on the said bed plate frame, a bed plate held laterally adjustable on the said tilting frame, a clamping plate fitted to slide on the said bed plate and provided wit-h a rod, the axis of which forms the center for the said tilting frame, an arm pivoted on the said bed plate frame and engaging the said rod, the said arm being adapted to receive a swinging motion on the upward movement of the said bed plate frame, so as to shift the said clamping plate, substantially as shown and described.

5. The combination with a bed plate frame,

of a tilting frame mounted to turn on thesaid bed plate frame, a bed plate held laterally adjustable on the said tilting frame, a clam ping plate fitted to slide on the said bed plate and provided with a rod, the axis of which forms the center for the said tilting frame, an arm pivoted on the said bed plate frame and en gaging the said rod, the said arm being adapted to receive a swinging motion on the upward movement of the said bed plate frame, so as to shift the said clamping plate, and blocks having inclines and adapted to be engaged by the free end of the said pivoted arm, substantially as shown and described.

6. The combination with a bed plate frame mounted to slide vertically, of a feed screw shaft engaging the said bed plate frame, a main driving shaft for imparting a rotary motion to the said feed screw shaft in either direction, and a shifting device, substantially as described,controlled from the said bed plate frame for imparting forward and backward motion to the said feed screw shaft, substantially as shown and described.

7. The combination with a chain tool and a shaft carrying a sprocket wheel over which passes the said tool, of a rotary fan mounted upon and driven by said shaft, and provided with a hood whose central inlet is behind and in close proximity to the said sprocket wheel and chain, substantially as shown and described.

8. The combination with achain tool and a shaft carrying a sprocket wheel over which passes the said tool, of a suction fan driven from the said shaft and having its inlet in close proximity to the said sprocket wheel and chain tool, and a hood held on the front of the casing of the said suction fan and extending down alongside of and curved over the top part of the said chain tool and over the said sprocket wheel, substantially as shown and described.

CHRISTIAN LOETSOHER.

Witnesses:

CHARLES H. REYNOLDS, F. G. GREENHOW. 

